جستجوی مقالات مرتبط با کلیدواژه « QEEG » در نشریات گروه « علوم انسانی »

Depression and anxiety are common psychological disorders, and due to the high prevalence of anxiety and depression disorders, this study examines the brain waves on non-verbal diagnosis and identifying depression and anxiety disorders. According to previous research, a decrease in alpha wave activity is predicting anxiety disorders, and an increase in beta and theta activity in the front of the head can predict the likelihood of anxiety disorders and depression.

  Over the past two decades, several conceptual models have been proposed for strategic thinking, but few tools have been developed to measure and study strategic thinking at the individual level. Neuropsychological techniques, as they have been used to study and measure the creative thinking over the past few decades, can help us in studying strategic thinking. In this paper, at first, conceptual models and different dimensions of strategic thinking and its measurement methods are reviewed. Similar researches in the field of creativity conducted using neurological approaches and brain imaging tools can be considered as a good guideline to help doing such a research. To study the function of the brain, it is necessary for the person, under investigation, to be given a cognitive assignment in order to think about it. While thinking about that assignment, their brain function can be studied, so the characteristics of cognitive assignments are described for the study of strategic thinking, and cognitive tasks for such studies are proposed to be selected within the field of electroencephalography. Finally, the results of a laboratory study are reviewed and the results will be analyzed.

The present research is a part of a comprehensive fundamental research. This research is descriptive and exploratory in nature and a pilot project was designed to collect and analyze the data. Due to the nature of the subject, the present research is a type of pilot project in which the dependent variable (brain wave patterns) has been studied after providing an independent variable (strategic thinking). The present study describes how to design cognitive assignments to study strategic thinking by reviewing the literature on strategic thinking and research on creativity in electroencephalography, and then, as a preliminary study in a laboratory research, examines strategic thinking and presents its results. A sample size of ten managers and middle managers from a nongovernmental educational center has been selected based on availability factors and brain imaging was done within two states of relaxation and strategic thinking using electroencephalographic tools.

The results show that changes in alpha wave intensity were significant in all regions of the cortex compared to other waves. Significant changes in the absolute intensity of alpha waves are comparable with the observed results in creativity-related experiments. In addition, changes in the intensity of alpha waves (12-8 Hz) were compared with each other in PT, TT, and ST cognitive assignments. The results indicate that changes in the intensity of alpha waves were significant in comparison with changes in other brain wave. During the day when we are awake, brain imaging by electroencephalography shows different types of brain electric waves at a time. These waves are classified from the lowest frequency (highest wavelength) to the highest frequency (shortest wavelength) as Delta, Theta, Alpha, Beta, and Gamma respectively. Alpha waves are in the range of 8 to 13 Hz and also the changes in the intensity of alpha waves (12 Hz) were compared within the three PT, TT, and ST cognitive assignments. Based on the paired T-test results, there is no significant difference in the alpha waves intensity variation between the cognitive tasks of ST and TT. But, there is a significant difference in the alpha waves intensity variation between the cognitive tasks of ST and PT.

The human brain should be able to create a large amount of alpha waves for creative inspiration. Creative people can use alpha-generated waves to solve the problems they face. Those lacking creativity, when faced with a problem, cannot produce more alpha waves, and consequently they cannot have creative ideas to solve problems. The proper level of alpha waves leads to relaxation on free time and enjoying the environment, optimal performance, less anxiety, stronger immune system, positive thinking, mind and body integrity, intuition, inner-thinking, emotional balance, euphoria, inner awareness and increased hormonal secretion of Serotonin. The results show that PT cognitive assignment is not suitable for studying strategic thinking. It seems that the cognitive role of TT is more appropriate for the study of strategic thinking in the field of electroencephalography, because the changes in the alpha intensity during this cognitive assignment showed a greater increase compared to the other two cognitive tasks. With regard to ST cognitive assignment, one can use this cognitive assignment if they follow the correct guidelines.

Nowadays, the research results suggest that brainwaves change in different Psychological conditions. In this regard, this study aims to investigate the cognitive challenges on quantitative electroencephalography (QEEG) pattern.
EEG was recorded from Cz in 26 right-handed individuals including 13 male and 13 female students. During two conditions: At rest condition Subjects looked at the white screen computer for one minute from a distance of 90 cm. Then, ‘React Traking soccer’ was run for one minute (cognitive challenges condition).
Findings: The data analysis showed that the main effect of mental condition (from rest to cognitive challenge) was not significant (F=2/73, P

In the recent years, the coherence index is used in many electroencephalographic studies for investigation of brain connectivity in children with ADHD disorder. It is suggested that the coherence is a useful index in discrimination of ADHD subjects from normal subjects. However, a few studies are accomplished in subtypes of ADHD to identify of differences in functional connectivity between ADHD subtypes. In this comparative study, the connectivity index of coherence between two hemispheres is compared between two groups with ADHD-combined type (ADHD-C, N=13) and ADHD-predominantly inattentive type (ADHD-I, N=10). The results show that the coherence between left temporal lobe and right frontal lobe is significantly increased in ADHD-combined type as compared with ADHD- inattentive type. This higher coherence is occurred in the Theta (4-8 Hz) and Alpha (8-12 Hz) frequency Bands. Results would suggest that hyperactivity and impulsivity in ADHD-combined type could be related to left temporal and right frontal connectivity deficiencies.